About 10 per cent of the population is colour blind and simply can't perceive as many colours as those with normal vision. There has never been any way to correct the condtion but now, a U.S. company claims they have created glasses that can open up a world of colour to users. But some eye experts remain skeptical. Colour blindness, or colour vision deficiency, as doctors call it, is more than just a nuisance. Most with the condition can't distinguish red from green and have trouble with aspects of everyday life. They can't become pilots, firefighters, electricians, police officers or...